<?php

/**
 * Flight: An extensible micro-framework.
 *
 * @copyright   Copyright (c) 2011, Mike Cao <mike@mikecao.com>
 * @license     MIT, http://flightphp.com/license
 */

namespace Vipkwd\Utils\Libs\Net\Util;

if (!interface_exists('JsonSerializable')) {
    require_once dirname(__FILE__) . '/LegacyJsonSerializable.php';
}

/**
 * The Collection class allows you to access a set of data
 * using both array and object notation.
 */
class Collection implements \ArrayAccess, \Iterator, \Countable, \JsonSerializable
{
    /**
     * Collection data.
     *
     * @var array
     */
    private $data;

    /**
     * Constructor.
     *
     * @param array $data Initial data
     */
    public function __construct(array $data = array())
    {
        $this->data = $data;
    }

    /**
     * Gets an item.
     *
     * @param string $key Key
     * @return mixed Value
     */
    public function __get($key)
    {
        return isset($this->data[$key]) ? self::encode($this->data[$key]) : null;
    }

    /**
     * Set an item.
     *
     * @param string $key Key
     * @param mixed $value Value
     */
    public function __set($key, $value)
    {
        $this->data[$key] = $value;
    }

    /**
     * Checks if an item exists.
     *
     * @param string $key Key
     * @return bool Item status
     */
    public function __isset($key)
    {
        return isset($this->data[$key]);
    }

    /**
     * Removes an item.
     *
     * @param string $key Key
     */
    public function __unset($key)
    {
        unset($this->data[$key]);
    }

    /**
     * Gets an item at the offset.
     *
     * @param string $offset Offset
     * @return mixed Value
     */
    public function offsetGet($offset):mixed
    {
        return isset($this->data[$offset]) ? $this->data[$offset] : null;
    }

    /**
     * Sets an item at the offset.
     *
     * @param string $offset Offset
     * @param mixed $value Value
     */
    public function offsetSet($offset, $value):void
    {
        if (is_null($offset)) {
            $this->data[] = $value;
        } else {
            $this->data[$offset] = $value;
        }
    }

    /**
     * Checks if an item exists at the offset.
     *
     * @param string $offset Offset
     * @return bool Item status
     */
    public function offsetExists($offset):bool
    {
        return isset($this->data[$offset]);
    }

    /**
     * Removes an item at the offset.
     *
     * @param string $offset Offset
     */
    public function offsetUnset($offset):void
    {
        unset($this->data[$offset]);
    }

    /**
     * Resets the collection.
     * 
     * @return void
     */
    public function rewind():void
    {
        reset($this->data);
    }

    /**
     * Gets current collection item.
     *
     * @return mixed Value
     */
    public function current():mixed
    {
        return current($this->data);
    }

    /**
     * Gets current collection key.
     *
     * @return mixed Value
     */
    public function key():mixed
    {
        return key($this->data);
    }

    /**
     * Gets the next collection value.
     *
     * @return void Value
     */
    public function next():void
    {
        next($this->data);
    }

    /**
     * Checks if the current collection key is valid.
     *
     * @return bool Key status
     */
    public function valid():bool
    {
        $key = key($this->data);
        return ($key !== NULL && $key !== FALSE);
    }

    /**
     * Gets the size of the collection.
     *
     * @return int Collection size
     */
    public function count():int
    {
        return sizeof($this->data);
    }

    /**
     * Gets the item keys.
     *
     * @return array Collection keys
     */
    public function keys():array
    {
        return array_keys($this->data);
    }

    /**
     * Gets the collection data.
     *
     * @return array Collection data
     */
    public function getData()
    {
        return self::encode($this->data);
    }

    /**
     * Sets the collection data.
     *
     * @param array $data New collection data
     */
    public function setData(array $data)
    {
        $this->data = $data;
    }

    /**
     * Gets the collection data which can be serialized to JSON
     *
     * @return mixed Collection data which can be serialized by <b>json_encode</b>
     */
    public function jsonSerialize()
    {
        return $this->data;
    }

    /**
     * Removes all items from the collection.
     */
    public function clear()
    {
        $this->data = array();
    }

    /**
     * 解码(xss)
     */
    private static function encode($data, $rxss = true)
    {
        if (is_array($data)) {
            foreach ($data as $k => $v) {
                $data[$k] = self::encode($v, $rxss);
            }
            return $data;
        } else {
            $type = gettype($data);
            switch ($type) {
                case "boolean":
                case "integer":
                case "double":
                case "NULL":
                    break;
                case "string":
                    $data = trim($data);
                    if (substr($data, 0, 1) == '{' && substr($data, -1) == '}') {
                        return self::encode(json_decode($data, true), $rxss);
                    } else {
                        $data = urldecode($data);
                        $data = trim($rxss ? htmlspecialchars($data) : $data);
                    }
                    break;
                default:
                    $data = Null;
                    break;
            }
            return $data;
        }
    }
}
